Plastic rooflights – Limitations on use and boundary distance

Table 5.8 Plastic rooflights – Limitations on use and boundary distance Minimum classification on lower surface (1) | Space which rooflight can serve | Minimum distance (m) from any point on relevant boundary to rooflight with an external surface classification of: AD, BD, CD (National class) or EROOF(t4) (European class) | CA, CB, CC, (National class) or DROOF(t4) (European class) | DA, DB, DC, DD (National class) or FROOF(t4) (European class) Class 3 (National class) or Class D-s3,d2 (European class) | (a) Balcony, verandah, carport, covered way or loading bay which has at least one longer side wholly or permanently open (b) Detached swimming pool (c) Conservatory, garage or outbuilding, with a maximum floor area of 40 m2 | 6 | 20 | — (d) Circulation space (except a protected stairway) (e) Room | 6(2) | 20(2) | — Notes: (1) As required by paragraph 3.14. (2) The rooflight should also comply with Diagram 5.6. (3) Single skin rooflight only, in the case of non-thermoplastic materials. Rooflights may have upper and lower surfaces with different properties if they have double skins or are laminates of different materials – in which case the more onerous distance applies. Where paragraph 4.21(a) applies rooflights should be at least 1.5 m from the compartment wall.